Merge pull request #5 from col3name/col3name-patch-2

Change project type from 'project' to 'library'

Author: col3name

composer.json

@@ -25,7 +25,7 @@
     "docs": "https://github.com/bearname/nowpayments-api-php/blob/master/README.md",
     "issues": "https://github.com/bearname/nowpayments-api-php/issues"
   },
-  "type": "project",
+  "type": "library",
   "require": {
     "php": "^7.4",
     "symfony/http-client": "^4.4"